Electric alarm-bell



(No Model.)

RlsEGEfiDAHL, ELEGTRIG ALARM BELL.

Patented Nov. 3, 1896.

UNITED STATES RUDOLPH SEGERDAIIL,

OF CHICAGO, ILLINOIS.

ELECTRIC ALARM-BELL.

SPECIFICATION forming part of Letters Patent No. 570,508, dated November 3, 1896.

Application filed June 27, 1892. Serial No. 438,226. (No model.)

To all whom it may concern:

Be it known that I, RUDOLPH SEGERDAHL, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Alarm- Bell, of which the following is a specification.

My invention relates particularly to improvements in electric alarm-bells; and the objects of my improvements are, first, to provide means for simplifying the general construction of this class of apparatus; second, to obviate undue action of the striker-lever; third, to reduce to a minimum the liability to derangement of the mechanism from wear, corrosion, dust, and other causes, and, fourth, to secure a compact structure. I attain these objects by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a view in perspective of the entire mechanism as it appears after the removal of the inclosing case; .Fig. 2, a horizontal section of the mechanism. Figs. 3 and 4: are detailed views of the striker-lever and the inclosing case, respectively; and Fig. 5 is a sectional view of that portion of the baseplate on to which the striker-lever is j ournaled.

Similar letters refer to similar parts in the different views.

The frame or base plate d (see Fig. 1) constitutes the body of the bell, the rib t', secured to the same, being adapted to support the casing m, so as to form an inclosure for the mechanism referred to hereinafter. The lug Z, secured to the rib "i, is arranged to enter the aperture 0 in the said casing, so as to secure its proper position in reference to the strikerlever which projects through the same.

The striker-lever in my device, speaking generally, consists of a lever of the first class, and is fulcrumed in close proximity to the rib '5, so as to permit of the aperture referred to in the said casing being reduced to a minimum. Furthermore, this striker-lever is, as shown in the drawings, fulcrumed to assume a diagonal position in reference to the sounding-piece c, which is located at the top of the frame (1. A compact structure may thus be attained and the different adjustments of the mechanism facilitated. The tension-spring n is applied to the said strikerlever in the usual manner and adapted to secure its proper adjustments with reference to the actuating mechanism provided for the same. However, with the striker-lever in the particular position, as above referred to, it also tends to maintain the same in a certain balance which I have found assures most effGCtlX G means whereby to prevent undue action of the striker-lever, so as to obviate false signals or jingling when the bell is exposed to a jarring motion.

The particular form of striker-lever I prefer to use in my device is shown in detail in Fig. This lever is preferably formed out of brass, having its upper arm terminating into a disk or striker w, and which is prefer ably, as shown, twisted so as to present its edge to the sounding-piece c, the lower arm of the lever being formed with the projections to a, and onto which is secured. in a suitable manner the contact-spring b, and the armature p, which is made of light weight, so as to attain the proper balance of the lever. The pivoted axis f is also preferably formed a part of the said lever and is adapted to sustain the position of the same in the stud 70, this stud being, as shown in Fig. 5, made in the form of a journal-bearing and adapted to be located in very close proximity to the rib t. The movement of the striker-lever at this point being thus made very slight, it is readily seen that the aperture required for the same in the casing on may be reduced to a minimum, and which assures a practically dustproof casing for the inclosed portion of the mechanism.

Other advantages will occur to those versed in the art to which my invention pertains.

The electromagnet g is preferably of the single-coil type and provided with pole extensions h h, which, as shown, are of a design adapted to provide a large attracting-surface for the armature p and make the bell sensitive in action. The contact-post j is preferably and as shown in the drawings of the construction shown in my Patent No. 540,367, and the same is arranged with reference to the contact-spring secured to the striker-lever in the usual manner.

The circuits and connections of the hereinabove-described device are, asshown in the drawings, the same as in bells of the ordinary construction.

I am aware that prior to my invention alarm-bells have been made with striker-levcrs consisting of levers of the first class. I am also aware of the fact that bells have been made dust-proof by means of a certain arrangem ent of their striker-levers in respect to the casing provided for inclosing their respective mechanisms, and therefore I do not claim the said features broadly; but

hat I do claim, and desire to secure by Letters Patent, is-

1. In an electric bell (or signaling device), a striker-lever consisting of a lever of the first class having the Weight LU, the shaft f, and the projections a a formed integral, and an armature p which is formed separate and secured to the said lever, substantially as and for the purpose described.

2. In an alarm-bell (or signaling device), the combination with a striker-lever consisting of a lever of the first class, of the baseplate d having a sounding-piece c and a suitable actuating mechanism for the said lever mounted thereon; the fulcrum of the said lever being located to permit the same to assume a position diagonally across the said base-plate, also adapted to permit of a suitable inclosing case for the said actuating mechanism to assume a position in reference to the said striker-lever as described, Whereby the aperture required in the said inclosing case to accommodate the action of the said striker-lever may be reduced to a minimum.

3. In an alarm-bell (or signaling device), the combination with its base-plate and an actuating mechanism mounted thereon, of a circular inclosing case for the said actuating mechanism, a striker-lever fulcrulned in close proximity to the aperture in the said inclosing case and arranged to assume a position diagonally across the said base-plate, and means adapted to support the said inelosing case and to retain its proper position in reference to the said striker-lever, substantially as and for the purpose described.

RUDOLPH SEGERDAIIL. In presence of- J. O. SCHILLESTAD, JOHN SHILLESTAI). 

